Aquarium cover



FIG. 1 is a top plan view of an aquarium cover embodying my new design;

FIG. 2 is a front edge elevational view, the rear edge being a mirror image thereof; and

FIG. 3 is an end elevational view.

The side opposite that shown in FIG. 1 is plain and unornamented. 

The ornamental design for an aquarium cover, as shown and described. 